Defensive publication



T575 :LQ DJ DEFENSIVE PUBLiCATION UNITED STATES PATFNT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 198R S45) (LG. 122i. Identification is by serial number of the application and the heading indicates the numhvr of pages of spvvillralion, including claims, and of sheets of drawing contained in the application as originally filed. Till illt of this application is available to the public for inspection; reproduction may he purchased for 30 cents per shoot.

Applications published under the Defensive Publication Progrma have not been examined as to the merits of alleged invention. The Patent Otlice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED MAY 27, 1969 formula:

N a 1 11 O where each R is -H, --NH -NHR', -NR -SH, -SR', -OH, -OR', NO COOH, -COOR, or halogen, each R being alkyl, e.g., methyl, ethyl, butyl, and the like. Examples of suitable antifoggants are 1,3- diaminobenzo [f] quinazoline, l-hydroxybenzo [f] quinazoline, l-mercaptobenzo[f]quinazoline, and l-hydroxy-3- aminobenzo[f]quinazoline.

Silver halide emulsions and elements stabilized as described can be chemically sensitized, e.g., with noble metal sensitizers alone or in combination with sulfur or selenium sensitizers. They can contain spectral sensitizers, incorporated color-forming couplers, incorporated developing agents, other antifoggants, hardeners, plasticizers, coating aids, vinyl polymers, and other suitable photographic addenda such as described in US. Patent 3,297,446 of Dunn issued Jan. 10, 1967 (columns 49). 

